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protocol/rtsp/rtsp.go: commenting and general clean up.

This commit is contained in:
Saxon 2019-04-17 18:31:03 +09:30
parent c9082c1b4c
commit e87eadf8fd
1 changed files with 118 additions and 44 deletions
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162
protocol/rtsp/rtsp.go
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@ -1,3 +1,58 @@
/*
NAME
rtsp.go
DESCRIPTION
rtsp.go provides functionality for forming and sending RTSP requests for
methods, DESCRIBE, OPTIONS, SETUP and PLAY.
AUTHORS
Saxon A. Nelson-Milton <saxon@ausocean.org>
LICENSE
This is Copyright (C) 2019 the Australian Ocean Lab (AusOcean).
It is free software: you can redistribute it and/or modify them
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
It is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
in gpl.txt. If not, see http://www.gnu.org/licenses.
Copyright (c) 2015, T. Jameson Little <t.jameson.little@gmail.com>
All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
3. Neither the name of the copyright holder nor the names of its contributors
may be used to endorse or promote products derived from this software without
specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package rtsp
import (
@ -23,6 +78,7 @@ const (
setup = "SETUP"
)
// session describes an RTSP session.
type session struct {
cSeq int
url *url.URL
@ -30,6 +86,8 @@ type session struct {
session string
}
// NewSession returns a pointer to a new session. The URL u will be parsed and
// a connection to the RTSP server will be made.
func NewSession(u string) (*session, error) {
s := &session{}
var err error
@ -44,14 +102,17 @@ func NewSession(u string) (*session, error) {
return s, nil
}
// Describe forms and sends an RTSP request of method DESCRIBE to the RTSP server.
func (s *session) Describe() (*Response, error) {
return s.writeRequest(describe, func(req *Request) { req.Header.Add("Accept", "application/sdp") }, nil)
}
// Options forms and sends an RTSP request of method OPTIONS to the RTSP server.
func (s *session) Options(urlStr string) (*Response, error) {
return s.writeRequest(options, nil, nil)
}
// Setup forms and sends an RTSP request of method SETUP to the RTSP server.
func (s *session) Setup(transport string) (*Response, error) {
return s.writeRequest(
setup,
@ -64,10 +125,16 @@ func (s *session) Setup(transport string) (*Response, error) {
)
}
// Play forms and sends an RTSP request of method PLAY to the RTSP server
func (s *session) Play() (*Response, error) {
return s.writeRequest(play, func(req *Request) { req.Header.Add("session", s.session) }, nil)
}
// writeRequest creates an RTSP request of the method given and writes it to the
// the session connection.
//
//headerOp and respOp define any operation that needs
// to occur to the request or response for the given method.
func (s *session) writeRequest(method string, headerOp func(*Request), respOp func(*Response)) (*Response, error) {
req, err := NewRequest(method, s.nextCSeq(), s.url, nil)
if err != nil {
@ -83,7 +150,7 @@ func (s *session) writeRequest(method string, headerOp func(*Request), respOp fu
return nil, err
}
res, err := ReadResponse(s.conn)
res, err := ReadResponse(bufio.NewReader(s.conn))
if err != nil {
return nil, err
}
@ -99,6 +166,7 @@ func (s *session) nextCSeq() string {
return strconv.Itoa(s.cSeq)
}
// Request describes an RTSP request.
type Request struct {
Method string
URL *url.URL
@ -110,6 +178,7 @@ type Request struct {
Body io.ReadCloser
}
// String returns a formatted string of the Request.
func (r Request) String() string {
s := fmt.Sprintf("%s %s %s/%d.%d\r\n", r.Method, r.URL, r.Proto, r.ProtoMajor, r.ProtoMinor)
for k, v := range r.Header {
@ -125,6 +194,7 @@ func (r Request) String() string {
return s
}
// NewRequest returns a pointer to a new Request.
func NewRequest(method, cSeq string, u *url.URL, body io.ReadCloser) (*Request, error) {
req := &Request{
Method: method,
@ -138,23 +208,22 @@ func NewRequest(method, cSeq string, u *url.URL, body io.ReadCloser) (*Request,
return req, nil
}
// Response describes an RTSP response.
type Response struct {
Proto string
ProtoMajor int
ProtoMinor int
StatusCode int
Status string
Proto string
ProtoMajor int
ProtoMinor int
StatusCode int
Status string
ContentLength int64
Header http.Header
Body io.ReadCloser
Header http.Header
Body io.ReadCloser
}
func (res Response) String() string {
s := fmt.Sprintf("%s/%d.%d %d %s\n", res.Proto, res.ProtoMajor, res.ProtoMinor, res.StatusCode, res.Status)
for k, v := range res.Header {
// String returns a formatted string of the Response.
func (r Response) String() string {
s := fmt.Sprintf("%s/%d.%d %d %s\n", r.Proto, r.ProtoMajor, r.ProtoMinor, r.StatusCode, r.Status)
for k, v := range r.Header {
for _, v := range v {
s += fmt.Sprintf("%s: %s\n", k, v)
}
@ -162,75 +231,80 @@ func (res Response) String() string {
return s
}
func ReadResponse(r io.Reader) (res *Response, err error) {
res = new(Response)
// ReadResponse will read the response of the RTSP request from the connection,
// and return a pointer to a new Response.
func ReadResponse(b *bufio.Reader) (*Response, error) {
res := &Response{}
res.Header = make(map[string][]string)
b := bufio.NewReader(r)
var s string
// TODO: allow CR, LF, or CRLF
if s, err = b.ReadString('\n'); err != nil {
return
s, err := b.ReadString('\n')
if err != nil {
return nil, err
}
parts := strings.SplitN(s, " ", 3)
res.Proto, res.ProtoMajor, res.ProtoMinor, err = ParseRTSPVersion(parts[0])
res.Proto, res.ProtoMajor, res.ProtoMinor, err = parseVersion(parts[0])
if err != nil {
return
return nil, err
}
if res.StatusCode, err = strconv.Atoi(parts[1]); err != nil {
return
res.StatusCode, err = strconv.Atoi(parts[1])
if err != nil {
return nil, err
}
res.Status = strings.TrimSpace(parts[2])
// read headers
for {
if s, err = b.ReadString('\n'); err != nil {
return
} else if s = strings.TrimRight(s, "\r\n"); s == "" {
s, err = b.ReadString('\n')
if err != nil {
return nil, err
}
s = strings.TrimRight(s, "\r\n")
if s == "" {
break
}
parts := strings.SplitN(s, ":", 2)
parts = strings.SplitN(s, ":", 2)
res.Header.Add(strings.TrimSpace(parts[0]), strings.TrimSpace(parts[1]))
}
res.ContentLength, _ = strconv.ParseInt(res.Header.Get("Content-Length"), 10, 64)
res.ContentLength, err = strconv.ParseInt(res.Header.Get("Content-Length"), 10, 64)
if err != nil {
return nil, err
}
res.Body = closer{b, r}
return
res.Body = closer{b}
return res, nil
}
type closer struct {
*bufio.Reader
r io.Reader
}
func (c closer) Close() error {
if c.Reader == nil {
return nil
}
defer func() {
c.Reader = nil
c.r = nil
}()
if r, ok := c.r.(io.ReadCloser); ok {
return r.Close()
}
c.Reader = nil
return nil
}
func ParseRTSPVersion(s string) (proto string, major int, minor int, err error) {
// parseVersion returns the protocol type, major version and minor version.
func parseVersion(s string) (proto string, maj, min int, err error) {
parts := strings.SplitN(s, "/", 2)
proto = parts[0]
parts = strings.SplitN(parts[1], ".", 2)
if major, err = strconv.Atoi(parts[0]); err != nil {
maj, err = strconv.Atoi(parts[0])
if err != nil {
return
}
if minor, err = strconv.Atoi(parts[0]); err != nil {
min, err = strconv.Atoi(parts[0])
if err != nil {
return
}
return